中国双峰驼古线粒体基因组揭示的母系差异

IF 1.1 4区 生物学 Q4 GENETICS & HEREDITY Mitochondrial Dna Part a Pub Date : 2019-09-23 DOI:10.1080/24701394.2019.1659250
Shun-Gang Chen, Ji Li, Fan Zhang, Bo Xiao, Jiaming Hu, Yin-Qiu Cui, M. Hofreiter, X. Hou, Guilian Sheng, Xulong Lai, Junxia Yuan
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引用次数: 3

摘要

国内双峰骆驼(Camelus bactrianus)曾是中国历史上最重要的家畜品种之一,也是古代丝绸之路上的主要运输工具。然而,对中国双歧杆菌的考古研究仍然有限,其分子生物学研究主要集中在现代标本上。在这项研究中,我们从中国西北出土的一种细菌标本中提取了完整的线粒体基因组,该标本的年代为1290-1180 cal。距今年(yBP)。利用18个线粒体基因组进行的系统发育分析表明,双歧杆菌可分为两个母系。来自伊朗到日本和蒙古的大部分样本属于A1亚支系,而我们的样本与两个蒙古个体组成了小得多的A2亚支系。此外,这两个母系的分化时间估计为165 Kya(95%可信区间117-222 Kya),这可能表明在最初的驯化过程中,几个不同的进化谱系被纳入了驯化基因库。贝叶斯天际线图(BSP)分析表明,从5000年前开始,双歧杆菌的雌性有效种群数量开始缓慢增长,这与双歧杆菌驯化的开始相对应。本研究还揭示了丝绸之路沿线地区双歧杆菌种群间存在着广泛的遗传信息交流。
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Different maternal lineages revealed by ancient mitochondrial genome of Camelus bactrianus from China
Abstract Domestic Bactrian camel (Camelus bactrianus) used to be one of the most important livestock species in Chinese history, as well as the major transport carrier on the ancient Silk Road. However, archeological studies on Chinese C. bactrianus are still limited, and molecular biology research on this species is mainly focused on modern specimens. In this study, we retrieved the complete mitochondrial genome from a C. bactrianus specimen, which was excavated from northwestern China and dated at 1290–1180 cal. years before present (yBP). Phylogenetic analyses using 18 mitochondrial genomes indicated that the C. bactrianus clade was divided into two maternal lineages. The majority of samples originating from Iran to Japan and Mongolia belong to subclade A1, while our sample together with two Mongolian individuals formed the much smaller subclade A2. Furthermore, the divergence time of these two maternal lineages was estimated as 165 Kya (95% credibility interval 117–222 Kya), this might indicate that several different evolutionary lineages were incorporated into the domestic gene pool during the initial domestication process. Bayesian skyline plot (BSP) analysis suggest a slow increase in female effective population size of C. bactrianus from 5000 years ago, which corresponds to the beginning of domestication of C. bactrianus. The present study also revealed that there were extensive exchanges of genetic information among C. bactrianus populations in regions along the Silk Road.
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来源期刊
Mitochondrial Dna Part a
Mitochondrial Dna Part a Biochemistry, Genetics and Molecular Biology-Genetics
CiteScore
3.00
自引率
0.00%
发文量
6
期刊介绍: Mitochondrial DNA Part A publishes original high-quality manuscripts on physical, chemical, and biochemical aspects of mtDNA and proteins involved in mtDNA metabolism, and/or interactions. Manuscripts on cytosolic and extracellular mtDNA, and on dysfunction caused by alterations in mtDNA integrity as well as methodological papers detailing novel approaches for mtDNA manipulation in vitro and in vivo are welcome. Descriptive papers on DNA sequences from mitochondrial genomes, and also analytical papers in the areas of population genetics, phylogenetics and human evolution that use mitochondrial DNA as a source of evidence for studies will be considered for publication. The Journal also considers manuscripts that examine population genetic and systematic theory that specifically address the use of mitochondrial DNA sequences, as well as papers that discuss the utility of mitochondrial DNA information in medical studies and in human evolutionary biology.
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